Toyota 2014 Sienna Manual page 388

2-5. Driving information
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Break-in schedule
If your vehicle is new or equipped with any new power train components
(such as an engine, transmission, differential or wheel bearing), Toyota rec-
ommends that you do not tow a trailer until the vehicle has been driven for
over 500 miles (800 km).
After the vehicle has been driven for over 500 miles (800 km), you can start
towing. However, for the next 500 miles (800 km), drive the vehicle at a
speed of less than 50 mph (80 km/h) when towing a trailer, and avoid full
throttle acceleration.
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Maintenance
●
If you tow a trailer, your vehicle will require more frequent maintenance
due to the additional load. (See "Scheduled Maintenance Guide" or
"Owner's Manual Supplement".)
●
Retighten the fixing bolts of the towing ball and bracket after approxi-
mately 600 miles (1000 km) of trailer towing.
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